Guide

One-length irons

A one-length (or single-length) set builds every iron to the same length, so you stand to the ball, place it and swing the same way with each. Cobra built its ONE Length sets at the 7-iron's 37¼": against its standard DARKSPEED set, the 4-iron is 2" shorter and the sand wedge 1¾" longer, while the lofts stay within a degree. Cobra's store listed no ONE Length iron set on 16 Oct, so a set now comes used, from $440.99, or from a smaller maker such as One Iron Golf, MAZEL, Sterling Irons or Wishon Golf.

Club by club: Cobra's DARKSPEED, standard and ONE Length

Cobra's 2024 DARKSPEED irons in two builds, from Cobra's own specification tables. Each pair of cells reads standard, then ONE Length.

Each iron's length, drawn to scale The outline is the standard set, the filled bar the ONE Length set. The scale starts at 34 inches.
Cobra DARKSPEED iron lengths: the standard set runs from 39¼" in the 4-iron to 35½" in the sand wedge; the ONE Length set is 37¼" in every iron. 4 5 6 7 8 9 PW GW SW 34" 35" 36" 37" 38" 39" 40"
Cobra DARKSPEED irons: loft, lie, length and offset of each club in the standard set and in the ONE Length set
ClubLoftLieLengthOffset
StandardONEStandardONEStandardONEStandardONE
4 18.5°19° (changed) 62°65° (changed) 39¼"37¼" (changed) 5.4 mm6.0 mm (changed)
5 21°22° (changed) 62.5°64.5° (changed) 38½"37¼" (changed) 4.6 mm5.1 mm (changed)
6 24°24.5° (changed) 63°64° (changed) 37¾"37¼" (changed) 3.9 mm4.2 mm (changed)
7 27°27° 63.5°63.5° 37¼"37¼" 3.2 mm3.2 mm
8 31.5°31.5° 64°63° (changed) 36¾"37¼" (changed) 2.6 mm2.6 mm
9 36.5°36.5° 64.5°62.5° (changed) 36¼"37¼" (changed) 2.0 mm2.0 mm
PW 42°42° 65°62° (changed) 36"37¼" (changed) 1.5 mm1.5 mm
GW 47.5°47.5° 65°61.5° (changed) 35¾"37¼" (changed) 1.0 mm1.0 mm
SW 54°54° 65°61.5° (changed) 35½"37¼" (changed) 1.0 mm1.0 mm

Bold: a figure the ONE Length build changes. Sources: Cobra's DARKSPEED irons and DARKSPEED ONE Length irons pages, archived copies. The standard set has its own page: Cobra DARKSPEED.

What one length changes

The construction does not change: Cobra describes its DARKSPEED ONE Length irons with the same hollow body, PWRSHELL face insert and PWR-BRIDGE weight as the standard set. The club length chart has every standard set's lengths if you want to compare another.

Cobra's three ONE Length sets

Every iron in all three is 37¼", and the lie steps from 65° to 61.5° in all three. The lofts and offsets differ a little:

Loft and offset of each club in Cobra's AEROJET, DARKSPEED and KING TEC-X ONE Length irons
ClubAEROJET (2023)DARKSPEED (2024)KING TEC-X (2025)
4 19° · 6.0 mm19° · 6.0 mm19.5° · 4.8 mm
5 21.5° · 5.1 mm22° · 5.1 mm22° · 4.3 mm
6 24° · 4.2 mm24.5° · 4.2 mm24.5° · 3.7 mm
7 26.5° · 3.2 mm27° · 3.2 mm27° · 3.0 mm
8 31° · 2.6 mm31.5° · 2.6 mm31.5° · 2.6 mm
9 36° · 2.0 mm36.5° · 2.0 mm36.5° · 2.2 mm
PW 41.5° · 1.5 mm42° · 1.5 mm42° · 1.8 mm
GW 47.5° · 1.0 mm47.5° · 1.0 mm48° · 1.5 mm
SW 54° · 0.5 mm54° · 1.0 mm–

Each cell: loft, then offset. A dash: not in that set. The KING TEC-X set adds "an internal 70g tungsten weight" to its hollow head, in Cobra's words, and calls itself a game improvement iron.

Where to get a set now

Questions golfers ask

What length are one-length irons?

Usually the 7-iron's length. Cobra built every ONE Length iron at 37¼", its standard 7-iron. Wishon starts its EQ1-NX sets at 36½", the 8-iron's, and its heads can be built anywhere from 35½" to 37½" when a fitting says so. MAZEL builds every club at 37½", Value Golf builds its Pinhawk SL at 37" unless asked otherwise, and One Iron Golf picks a length from 36" to 39" by your wrist-to-floor measurement.

Are one-length irons good for beginners and high handicappers?

Cobra built its DARKSPEED and AEROJET ONE Length sets with the same construction as their standard sets. What changes is the setup: one ball position and one posture for every iron, which Cobra sells as the point of them. The catch is at the top of the set, where the 4- and 5-iron are shorter than usual and need enough clubhead speed to get the ball up: Wishon starts a set anywhere from the 4- to the 7-iron by that speed, and two of Cobra's three stock sets started at the 5-iron.

Does Cobra still make one-length irons?

Not as iron sets on its own store: on 16 Oct Cobra's ONE Length collection held only the KING TEC-X ONE Length hybrid, and the DARKSPEED, AEROJET and KING TEC-X ONE Length iron pages open its men's clubs list.

Can I get one-length irons in a senior flex?

Cobra's DARKSPEED and AEROJET ONE Length sets came with KBS PGI graphite in senior (A) flex as well as regular and stiff; the cheapest used DARKSPEED ONE Length set at 2nd Swing on 16 Oct was a senior-flex set. The senior flex guide explains the difference, and Cobra AEROJET and Cobra DARKSPEED have the standard sets.